Needle vibration controlling means for zigzag stitch sewing machines



May 28 1941); w. BOLTER ET AL I NG MEANS FOR ZIGZAG STITCH SEWING MACHINES NEEDLE VIBRATiON CONTROLLI V 2 Sheets-Sheet 1 Filed April 12. 1937 I INVENIORS BY M M May'ZS, 1940. I w. BULTER :1- AL NEEDLE VIBRATION commomms MEANS FOR new s'rrrc Filed April. 12, 1957 H snwme MACHINES 2 Sheets-Sheet 2 I INVENTORS VQMM 5W1 -L lwma MA v Patented May 28, 1940 i Wilhelm mar,

Heepen in Westphalia, near Bielefeid, and Heinrich Theenhausen, Bielefeid, Germany, assignors to Anker-Werke, A. G., Bielefeld, Germany, a corporation of Germany Application Aprilglz, 1937, Serial No. 136,340

In Germany August 29, 1935 6 Claims.

Referring to the drawings, in which an illus-v trative embodiment of the inventionis shown,

Figures 1 to 3 show one adjustment of the parts for a quilting seam in the middle of the stitching range; Figures 4 to 6 show anadjustment of the parts for a quilting seam at one side of the middle of the stitching range. In particular. Fig. 1 is a vertical section taken behind the setting lever.

Fig. 2 is a vertical section taken in front of the setting lever, with the cap removed.

Fig. 3 is a front elevation of the device with u all parts assembled.

Figs. 4, 5 and 6 are views respectively similar to Figs. 1, 2 and 3, with the setting lever shifted to another position.

Fig. '7 is a vertical section along the axis of the m bearing for the shaft of the grooved cam.

Fig. 8 is a plan View of the cap.

Fig. 9 is a stitch diagram.

The invention is illustrated in the form of an improvement upon the needle controlling mechanism disclosed in prior patent to Biilter, dated June 23, 1936, No. 2,045,340; similar parts being identified by the same reference characters, namely, the grooved cam 8 and the setting handles Band l2.

Upon a base plate 3| is rotatably mounted a rotary bearing II), to which is rigidly fixed by a screw 3 a plate 54 having attached to it a setting lever l2 which serves to shift the base line on which the needle operates.

In' the bearing ill a shaft 33 is rotatably mounted eccentrically to the axis of the hearing. The inner end of the shaft 33'bears a grooved cam 8. ,Upon the outer end of the shaft 33 a toothed segment 5| is fastened by 60 means of a set screw segment 5| meshes a broad pinion 53, which -is mounted by a pin 55 upon the plate 54 of the setting lever I2. The toothed segment 5| has a one-sided extension 56, in which a cam slot 51 is out. In the cam slot 51 engages a 52. With this toothed.

guide pin 62, which is riveted to the base plate 3|. A pointer disc 59 is fixed to the reduced frontv end of the pinion member 53 by a set screw 4 passing through its hub -58. The hub has a downwardly extending adjusting handle 9 5 for regulating the size of the zigzag stitches.

The two setting positions of the setting lever H are determined by two notches 6| of a cap 62a mounted by screws 5 upon the base plate 3|. The cap 620 has upon it two scales 63 and 10 64, only one of which is visible at a time, becguse the other is covered by the pointer disc 5 The device described operates in the following manner: When the setting lever I2 is in the posi- 15 tion shown in Fig. 3, the scale 64 is visible. 1 If the adjusting handle 9 is set to the zero position of thescale, a quilting stitch in the middle ofthe stitching range results, as shown at the top of Fig. 9. By changing the position of the go adjusting handle 9, the size of the zigzag stitches extending from the middletoward both extremities of the stitching range can be increased.

When the setting lever 12 is shifted from theposition shown in Fig. 3 to the position shown 5 in Fig. 6, at first therev is no rotation of the toothed*segment 5| and the pinion 53 about their own axes, because of the simultaneous swinging of the shaft 33 and pin about the axis of the bearing l0. However, by this swingo ing motion the angular position of the grooved cam 8 is changed, so that an alteration of the size of the stitch would result if the former. angular position were not restored by a subsequent adjustment is taken care of by the particular form of the cam slot 51 working in combination with the pin 62.

For instance, if the pin 62 has. assumed the position shown at 65 in dotted lines in..Fig.' 2, mv

as a result of its relative motion within the cam slot 51, further rotationof the settinglever l2 will cause a combined swinging and turning motion of the parts 53 and 5|, because the pin 62 glides in the cam slot 51 from the position 5' 65 toward the position 66, also indicated by dotted lines in Fig. 2. By this movement the pointer disc 59 is displaced from the position shown in Fig. 3 to the position shown in Fig. 6, thereby uncovering the scale and covering 50 the scale .64.

By' changing the setting of the setting lever 8, an angular adjustment of the slotted guide 8 is accomplished through the action of the pinion 53 and toothed segment 5|, which causes a backward adjustment. This backward 1. In a needle vibration controlling means for zigzag stitch sewing machines, an angularly adjustable grooved cam for controlling the lateral throw of the needle, means comprising a rotatable member for shifting said cam along an arcuate path to change the origin of the lateral throw of the needle, and means effective during the shifting of said cam for angularly adjusting said cam to compensate for the angular movement which would otherwise be imparted to it by its shifting, thereby retaining the same amplitude of lateral throw of the needle.

2. In a needle vibration controlling means for zigzag stitch sewing machines, a bearing member mounted to rock on a fixed axis, a grooved cam mounted eccentrically on said bearing mem her so as to be capable of angular adjustment about an axis parallel to the axis of said bearing member, means for rocking said bearing member, means for angularly adjusting said cam, and means engaging said last means to restrain it from incorrect movement when said bearing member is rocked, thereby to prevent angular movement of said cam.

3. In a needle vibration controlling means for zigzag stitch sewing machines, an angularly adjustable groove cam for controlling the lateral throw of the needle, means for moving said cam bodily along an arcuate path to change the origin of the lateral throw of the needle, mechanism including a crank connected to said cam for adjusting the latter angularly to change the extent of lateral throw of the needle, and means engaging said crank restrain thesame as said cam is moved-- bodily, thereby to turn said crank I to compensate} for the angular movement which would otherwisebefimparted to said cam.

4. In a needle vibration controlling means for zigzag stitch sewing machines, an, angular adjustable "grooved cam for controlling'the lateral throw of the needle, a pivoted setting member on which said cam is mounted, a toothed segment positively connected to said cam, a pinion rotatably mounted on said setting member meshing with said toothed segment, and manipulative means for rocking said pinion.

5. In a needle vibration controlling means for zigzag stitch sewing mechines, an angularly adjustable grooved cam for controlling the lateral throw of the needle, a pivoted setting member on which said cam is mounted, a toothed segment positively connected to said cam, a pinion rotatably mounted on said seeting member meshing with said toothed segment, manipulative means for rocking said pinion, a cam segment connected to said toothed segment, and a stationary pin engaging said cam segment to control the angular movement of said toothed segment and the cam connected thereto.

6. In a needle vibration controlling means for zigzag stitch sewing machines, an angularly adjustable grooved cam for controlling the lateral throw of the needle, a pivoted setting member on which said cam is mounted, a toothed segment positively connected to said cam, a pinion rotatably mounted on said setting member meshing with said toothed segment, manipulative means for rocking said pinion, a cap covering said segment and pinion, a shaft projecting rigid- 1y from said pinion through said cap, manipulative means secured to said shaft in front of said cap and comprising a cover plate and pointer, said cap having thereon two separate scales alternately covered by said cover plate as said setting member is moved from one position to another. I

WILHELM B6LTER. HEINRICH THEENHAUSEN. 

